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author | Nicholas Piggin <npiggin@gmail.com> | 2018-04-25 15:17:59 +1000 |
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committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-07-24 22:03:14 +1000 |
commit | 5b73151fff63fb019db8171cb81c6c978533844b (patch) | |
tree | 61c17b513c864371636878b3d47aede38661632c /arch/powerpc/include/asm/btext.h | |
parent | 9b81c0211c249c1bc8caec2ddbc86e36c550ce0f (diff) | |
download | linux-stable-5b73151fff63fb019db8171cb81c6c978533844b.tar.gz linux-stable-5b73151fff63fb019db8171cb81c6c978533844b.tar.bz2 linux-stable-5b73151fff63fb019db8171cb81c6c978533844b.zip |
powerpc: NMI IPI make NMI IPIs fully sychronous
There is an asynchronous aspect to smp_send_nmi_ipi. The caller waits
for all CPUs to call in to the handler, but it does not wait for
completion of the handler. This is a needless complication, so remove
it and always wait synchronously.
The synchronous wait allows the caller to easily time out and clear
the wait for completion (zero nmi_ipi_busy_count) in the case of badly
behaved handlers. This would have prevented the recent smp_send_stop
NMI IPI bug from causing the system to hang.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/include/asm/btext.h')
0 files changed, 0 insertions, 0 deletions